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Comprehensive recovery method of vanadate-chromate-containing solution

A technology of vanadium-containing chromate and recovery method, applied in the field of inorganic chemistry, can solve the problems of difficulty in meeting large-scale industrial production, waste of resources, environment, complex process, etc., and achieves good use effect, large processing capacity, and short process flow. Effect

Inactive Publication Date: 2015-02-11
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the complexity of the process and the limitation of the processing capacity of the ion exchange column, this process is difficult to meet the needs of large-scale industrial production
[0007] So far, there is no mature technology in the world to effectively separate vanadium-chromium-containing industrial waste residues. Most enterprises can only use landfill or process them into low-value-added vanadium-chromium alloys, resulting in waste of resources and environmental pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Get 3L containing V1.5g / L, Cr3.1g / L, pH value is 1.7 vanadium slag extracting vanadium after adding acid and precipitating liquid, first according to pentavalent vanadium and hexavalent chromium in the solution respectively reduce to tetravalent vanadium and Add sodium sulfite to 1.1 times the stoichiometric total of trivalent chromium, stir at room temperature for 0.5 hours, add ammonia water to adjust the pH value to 7.5, precipitate vanadium and chromium, and filter to obtain vanadium-chromium-containing slag. Add water to the vanadium-chromium-containing slag at a solid-to-liquid ratio of 1:8g / ml, stir to raise the temperature, add alkali to adjust the pH value to 12, leaching at 65°C for 4 hours under normal pressure, and filter to obtain the vanadium-containing filtrate and chromium-containing filter cake. Calcinate the chromium-containing filter cake at 850°C for 2 hours to obtain chromium oxide containing V<0.1% and a purity of 98.3%; add dilute sulfuric acid to ...

Embodiment 2

[0031] Take 5L of vanadium slag for secondary extraction of vanadium to obtain the alkaline immersion solution containing V4.3g / L and Cr1.3g / L, first add magnesium sulfate to purify and remove impurities at a pH value of 8.5, and then add sulfuric acid to adjust the pH value to 2.5 , and according to the reduction of pentavalent vanadium and hexavalent chromium in the solution to twice the stoichiometric total of tetravalent vanadium and trivalent chromium respectively, feed sulfur dioxide, reduce at 40°C for 2.5 hours, add sodium bicarbonate to adjust the pH value to 6.5, and precipitate Precipitate the vanadium and chromium, and filter to obtain vanadium-chromium-containing slag. Add water to the vanadium-chromium-containing slag at a solid-to-liquid ratio of 1:3g / ml, add alkali to adjust the pH value to 11, stir and raise the temperature to about 0.7Mpa, leaching at 165°C for 1 hour, and filter to obtain vanadium-containing filtrate and chromium-containing filter cake. The ...

Embodiment 3

[0033] Take V0.3g / L, Cr2.3g / L, pH value of 7.7 vanadium slag alkaline immersion solution plus ammonium vanadium precipitation solution 10L, first add hydrochloric acid to adjust the pH value to 3.5, and then press pentavalent vanadium and hexavalent vanadium in the solution The chromium is respectively reduced to 2.8 times of the stoichiometric total of tetravalent vanadium and trivalent chromium. Add iron powder, reduce at 70°C for 4.5 hours, filter to remove unreacted iron powder, and then add sodium hydroxide to the solution to adjust the pH value to 8.0. The vanadium and chromium in it are precipitated out, and the chromium slag containing vanadium and iron is obtained by filtering. The contents of vanadium and chromium in the filtrate all meet the industrial wastewater discharge standards stipulated by the state. Add water to the chromium residue at a solid-to-liquid ratio of 1:5g / ml, stir to raise the temperature, add alkali to adjust the pH value to 10.5, leaching at 95...

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Abstract

A comprehensive recovery method of a vanadate-chromate-containing solution is characterized by: firstly adding a reducing agent to respectively reduce pentavalent vanadium and hexavalent chromium in the solution into tetravalent vanadium and trivalent chromium under proper pH conditions, then adding an alkali to adjust the pH value and further to precipitate vanadium and chromium in the solution, filtering to obtain vanadium-chromium-containing slag, then adding the vanadium-chromium-containing slag into an alkaline solution to selectively leach out vanadium, and then adding acid into the leaching solution to adjust the pH value and further to precipitate vanadium, so as to realize effective separation and recovery of vanadium and chromium and directly obtain the vanadium product and the chromium product. The comprehensive recovery method has the advantages of being short in process flow, good in separation effect, simple in operation, environment-friendly and the like, the recovery rate of vanadium reaches up to 95% or more and the recovery rate of chromium reaches up to 97% or more, and the comprehensive recovery method is applicable to large-scale industrialization.

Description

technical field [0001] The invention belongs to the field of inorganic chemistry, and in particular relates to a method for comprehensive recovery of vanadium-containing chromate solution, which is suitable for the leaching solution of steelmaking vanadium slag, vanadium-containing chromate wastewater, and vanadium-chromate-containing slag obtained by purifying vanadium-containing chromate wastewater Comprehensive recycling. Background technique [0002] Because of their similar properties, vanadium and chromium usually exist in minerals in a symbiotic manner in nature. The vanadium-titanium magnetite mined in Panzhihua, Xichang, Chengde and other areas in my country is a typical representative of this kind of minerals. The vanadium slag produced during the smelting process of vanadium-titanium magnetite is the main raw material for vanadium smelting in my country. The technological process of extracting vanadium from vanadium slag is: sodium roasting of vanadium slag—wate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B34/22C22B34/32
CPCY02P10/20
Inventor 王学文王明玉王华光
Owner CENT SOUTH UNIV
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